package org.eoti.ai.genetic.gp.example1;

import org.eoti.ai.genetic.gp.Criteria;
import org.eoti.ai.genetic.gp.Function;
import org.eoti.ai.genetic.gp.ProgramException;
import org.eoti.ai.genetic.gp.Node;

import java.math.BigInteger;

/**
 * The MIT License
 * <p/>
 * Copyright (c) 2009 Malachi de AElfweald (malachid@gmail.com)
 * <p/>
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 * documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to the following conditions:
 * <p/>
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
 * Software.
 * <p/>
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
public class Divide
extends Function<BigInteger, BigInteger>
{
	public Divide(  ){super();}

	@Override public String getDisplayString(){
		return "/";
	}

	@Override public Divide newInstance(){
		return new Divide();
	}

	@Override public boolean isPopulated()
	{
		return size() == 2;
	}

	@Override public void autogenerate( Criteria<BigInteger, BigInteger> criteria )
	{
		while(size() < 2)
		{
			Node<BigInteger,BigInteger> node  = criteria.getRandomNode();
			if(!node.isPopulated())
				node.autogenerate(criteria);

			add(node);
		}
	}
	
	public BigInteger execute()
			throws ProgramException
	{
		if(super.size() != 2)
			throw new ProgramException("Divide requires 2 parameters, but have %d", super.size());

		BigInteger left = get(0).execute();
		BigInteger right = get(1).execute();
		if(right.equals(BigInteger.ZERO))
			throw new ProgramException("Divide/0 not allowed");
		
		return left.divide(right);
	}
}
